X-Men is finally making its way to television, where FX is developing Legion, which is set to star Aubrey Plaza, Dan Stevens, and Jean Smart.

With all the success that has been seen on Netflix and some TV networks with superhero shows, Marvel revealed back in October that it was ready to take their X-Men characters and make good use of them on TV. THR reports that Legion has cast some of the show’s characters.

Joining the cast is Downton Abbey’s Dan Stevens, Parks and Rec’s Aubrey Plaza, and Fargo’s Jean Smart, and the pilot will be directed by Fargo’s Noah Hawley.

Legion’s pilot will introduce the story of David Haller, a character who is more than human, and has struggled with what was thought of as mental illness since puberty. He was diagnosed as schizophrenic, and has been in and out of hospitals throughout his younger years.

After a run in with a fellow patient, he starts to realize that the voices he hears and what he sees might actually be real, which changes the course of his life. David is actually Professor X’s son in the comics, and his mom is Holocaust survivor Gabrielle Haller.

Dan Stevens will star as David Haller, and he’ll struggle to come back from a life of being told he was insane from a young age. When he’s about to give up, he meets the girl of his dreams.

Aubrey Plaza will play Lenny, his friend, who has struggled with a life of drugs and alcohol. She seems to know that her life is going to turn around and this is what gives Lenny hope, her optimism and “likeable energy” is nice to see despite her rough exterior.

Legion comes from FX Productions and Marvel Television. Noah Hawley will write the pilot and serve as an executive producer alongside Lauren Shuler Donner (X-Men: Days of Future Past), Bryan Singer (X-Men: Days of Future Past, X-Men: Apocalypse), Simon Kinberg (X-Men: Days of Future Past, The Martian) and Marvel Television’s Jeph Loeb (Agents of SHIELD, Daredevil) and Jim Chory (Daredevil).

Production on Legion is set to begin in early March. We look forward to finding out who will else will join the show, as well as which mutants we may run into.